Accepts invitation for the 20th.

There is much weight in what RIM says about not breaking up the natural history collection of the British Museum. The botanical collection might be moved to Kew, but CD thinks "it would be the greatest evil which could possibly happen to natural science in this country if the other collections were ever to be removed from the British Museum and Library".

Extremely sorry for trouble he has given about his signature.

One child dangerously ill with diphtheria, another with much fever.

Much obliged for note from Alexander von Keyserling. Geologist going one inch with CD more important than naturalist going two or three.

Gives CD page references [in The new statistical account of Scotland, vol. 14, pp 446, 507] for information regarding parallel roads.

Is sending CD an article which he hopes will make him see that there are more causes than ice to account for the structure and wearing away of rocks. [Possibly "On the relative powers of glaciers and floating ice-bergs in modifying the surface of the earth", Can. Nat. 2 (1865): 21–33.] [J. of R. Geog. Soc. London 34 (1864)]